Engine muffler



Dec. 7 1926.'

C. E. SUMMERS ENGINE MUFFLER 2 Sheets-Sheet l Invenlur. 6144 Z. M

his MEII'HE: s

r} n" N N 11 JJ Filed Oct. 26, 19

Dec. 7 1926. 1,609,740

3. E. SUMMERS ENGINE MUFFLER Filed Oct. 26, 1923 2 Sheets-Sheet 2 Irlv 2111!:11"

w 5% WWWM JL LHEY Patented Dec. 7, 1926.

Ul llED STATES PATENT OFFICE.

CALEB E. SUMMERS, OF DAYTON. OHIO, ASSIGNOR TO GENERAL MOTORS RESEARCH CORPORATION, OF DAYTON, UI'ITQ, A GORPGRATION OF DELAWARE.

ENGINE MUFFLER.

Application filed October 26, 1823.

This invention relates to mufilers for internal-combustion engines and mciudes among its objects to muiiie an engine by apparatus which is more slinple in construction and effective in operation. 1

Further objects and advantages of the present invention will be apparent from the following description, reference being had to the accompanying drawing wherein pre fer-red forms of embodiments of the presentinvention are clearly shown.

in the drawings:

Fig. l is a side view of the mull'ler.

Fig. 2 is an end View.

Fig. 3 is a perspective View.

Fig. 4 is an edge view of a modilied form of mulller.

Fig. 5 is a bottom plan View thereof.

Fig. 6 is a sectional view on the line 66 of Fig. 5.

The mufller comprises a hollow torus or annular tubular member 20 provided with an internal annular opening 21 continuous with the inner circumference of member 20 which provides the outlet from the annular member 20 to a central space which is lo cated between two plates clamped by means of bolt 23 and nut 24 against, opposite sides of the annular member 20. Each plate is provided with feet so that the plates will be spaced from the sides of the portion 20 to provide circular outlets for the muliler. The mull'ler inlet pipe 26 is of a smaller di ameter than the diameter of the annular tube 20 and is connected tangentially therewith. A fitting 27 may be attached to the pipe 26 to cooperate with a bolt 28 and a nut 29 to connect the pipe 26 with the flanged end 30 of an engine exhaust pipe 31.

When the engine exhaust is conducted from the exhaust pipe into muli'ler, these haust gases are directed against the outer wall of the annular tube 20' as indicated by arrows 32. The pressure of the exhaust produce a whirling movement of the gases in the tube 20. lncoming gas will force the gas previously delivered to the muffler out through the opening 21 into the space between the plates 22 which further muflle the sound of the exhaust.

The whirling gas within the annular tube 20 constitutes a gaseous flywheel or rotating annulus of gaseous matter which is maintained in rotation between explosions of the engine. It is understood that this flywheel Serial No. 670,989.

action assists in dragging exhaust gases from the pipe 26, thereby tending to reduce back pressure in the exhaust pipes 31 and 26. This continuously rotating gaseous flywheel receives the intermittent puffs of exhaust from the pipe 26 which keep the gaseous flywheelin motion. But the exit of gas from the flywheel goes on continuously and at a relatively constant rate which is conducive to mulllin It is also desirable that the tube 20 be larger in bore than the pipes 31 and 26 in order that the pressure in the exhaust will be materially reduced as it enters the muiiier.

Figs. 4, 5 and 6 show another form of the invention. In these figures the mufiier which is designated in its entirety by numeral 40, includes two half shell portions 41 and 42 which are formed preferably of sheet material so as to provide annular half-tubular portions 43 and 44 respectively. WVithin the portion 43 the shell 41 is provided with a llat web portion 45, and within the portion 44 the shell 42 is provided with a spherical web portion 46 having the apertures 47. The shell portions 41 and 42 are provided with outwardly extending flanges 49 and 50 which are attached together by means of rivets 51 and by turning the flange 49 over the flange The material joining the annular portion 44 with the web portion 46 includes a flat annular portion 48. The web 45 is spaced from this portion 48 except where the web is provided with a plurality of depressions 45 which engage the portion 48. The half shell port-ions are attached together also by rivets 52 passing through the portion 48 of the half shell 42 and the portions 45 of the half shell 41. Therefore, between the rivets 52 openings 54 provided.

The attaching of the half shell portions together in the manner described provides an annular tubular chamber 53 into which the exhaust pipe 55 enters. The exhaust gases whirling in the chamber 53 pass out the openings 54 between the rivets 52 into an approximately semi-spherical reservoir 56 between the portions 45 and 46 and thence out through the openings 47.

This form of the invention provides for manufacturing from sheet material. The mufiier is preferably mounted with its an nular chamber 53 in a horizontal plane and the web portions 46 extending downwardly.

The shell portion a l can therefore be located adjacent the under surface of a horizontal support and the discharge of the muffler akes ,placefrom the under side thereof... Thls constructionmakes the muffler suscep-,

tible of mounting just below the underside of the floor of an automobile.

iVhile the form of embodiment of the present invention as herein disclosed, consti-' tutes a preferred form, it is to be, understoodthat other forms mightbe; adopted, all coming within the scope of the claim which follows:

What I claim is as follows :7

An engine exhaust mufiier comprising, in combination two half shell portions each having an annular half-tubular portion, and. one of whlch shell portions 1s provlded with a fiat imperforate web portion located withneoaveo kin and enclosed bythe outer half-tubular cal portionof the other; the ishe11* ortions being, constructed toiprovide passages between sald annular tubular chamber and the chamber included between the-fiat "web and l the semi-spherical portions aforesaid. I

In testlmony whereof '1 hereto affix my signature.

CALEB 'E'. SUMMER SI 

